Centrifugal governor



May 1, 1923. 1,453,452

H. F. DOBBIN CENTRIFUGAL GOVERNOR Filed Dec. 29 1921 Patented May 13 1923i UNITED STATES HENRY F. DOBBIN, OF NEW YORK, N. Y., ASSIGNOR TO WESTERN PATENT OFFICE.

ELECTRIC COMPANY,

INCORPORATED, F NEW YORK, N. Y., A CORPORATION OF NEW YORK.

CENTRIFUGAL GOVERNOR.

Application filed December 29, 1921. Serial No. 525,762.

To all whom t may concern f Be it known that I, HENRI F. DOBBIN, a citizen of the United States, residing at New York, in the county of New York,

State of New York, have invented certain new and useful Improvements in Centrifugal Governors, of which the following is a full, clear, concise, and exact description.

This invention relates in general to centrifugal governors, and particularly to improvements whereby the adjustment of the operating speeds of centrifugal governors'is facilitated. This [invention is a modication of the form of governor disclosed in my copending application Serial No. 428,695,

filed December 6, 1920.

It is an object of the present invention to simplify the operation of adjusting the speed of governors such as are used on impulse senders of the type employed in automatic telephone practice.

Another object of the invention is to provide a governor which is capable of adjustment toa fine degree and in which speed anduniformity of operation does not vary materially irrespective of the position of the governor.

In the operation of impulse senders such as are employed in automatic telephone practice, it is necessary to insure a certain speed of operation in order that the impulses shall be propagated neither too fast nor too slow for satisfactory operation with the associated apparatus. Adjustments are frequently made by more or less unskilled workmen and it is therefore desirable that the apparatus be as simple as possible and adjustable without the use of special tools.

The invention provides a governor in which each of the fly weights is provided with apliable adjustable arm and these arms are attached by means of retractile springs to a rotatable adjusting member. The rotation of the adjustable member in one direction or the other will effect an increase or a decrease in the speed of operation of the governor, depending upon which way the arm is moved. The adjustable arms are preferably arranged to be bent so that a uniform tension is obtained for the retractile springs. The rotatable member may then be rotated either in a direction to increase the tension of the retractile springs thereby increasing the speed of operation of the governor, or it may be rotated in a direction to decrease the tension of the spring members resulting in an increased braking effect and a decreased speed of operation.

Referring to the drawings, Fig. 1 is a view of an impulse sender or what is more frequently termed a calling device. A device of this character is described in detail in U. S. Patent No. 1,286,982, to 0. F. Forsberg.

Fig. 2 is a partial view of the rear of the calling device shown in Fig.l 1 and discloses a governor embodying the features of this invention.

Fig. 3 is an enlarged view of the governor. Fig. 4c is a section view taken along the line ld of Fig. 3.

As described in detail in the above mentioned patent to Forsberg, the calling' device comprises a rotatable dial provided with a. circular row of finger holes 5 5. This dial when rotated in a clockwise direction winds a motor spring. The impulse mechanism is not operated during the clockwise operation of the dial but when the latter is released it returns to its normal position by virtue of the motor spring and during this return movement the impulse mechanism is operated.

Since these impulses must be uniformvin order to satisfactorily operate the mechanisms associated therewith, it is necessary that the return movement of the dial be accurately governed. Upon the rotation of the dial in a clockwise direction, a gear 6 is likewise rotated in the same direction, and rotation of this gear is transmitted through pinion 7 and gear 8 to pinion 9 which is likewise rotated in a clockwise direction. Pinion 9 is loosely mounted on shaft 10 and is therefore ineffective during the clockwise movement of the dia-l. However, upon thc return movement of the dial, pinion 9 engages pawl 11 and carries the latter around with it. Pawl 11 is pivotally mounted on the spider or support 12 which is rigidly secured to shaft 10. The moving parts of the governor are pivotally mounted upon the spider 12, these comprising the iy weights 13-13, each of which is provided at its outer end with a pliable adjusting arm 14. The outer ends of adjusting arms 14-14 are provided with helical retractile springs 15-15 which are secured at the other end to arms extending from the adjustable rotatable member 16. This adjustable member is rotatable about the shaft 1() and is provided with a segmental slot 17 which permits it being locked in a given position by means of the screw 18 engaging threads in Ythe rotatable member' 22. Member 16 is also provided with an extension which is in the form of a pointer 19 and which is adapted to cooperate with a scale calibrated on one of the fly weights 13. The letters F and S are inscribed at the extremities of the scale indicating which direction the pointer should be moved in order to increase or decrease the speed of operation of the governor. The Hy weights preferably are provided with cork inserts20L-20 which serve as friction members, and upon engag` ing the inside of the cup 21 governV the speed of rotation. Any increase of the speed of rotation tends to throw the fly weights further from the center thus increasing the pressure with which the inserts 20 bear against the casing. The resistance to rotation is thus increased and tends to offset the increased force of rotation thereby maintaining the speed of the governor at a substantially constant value. n

In the device disclosed, an approximate adjustment is first made by placing the rotatable member 16 in approximately its mid position and bending the adjusting arms 1414 until the tension of the helical springs 15-15 is the same and` of a desired value. A line adjustment is then obtained by rotating the member 16 until the desired speed of rotation is attained, the member 16 then being lockedsecurely in place by means of screw 18. Since the spring members 15-15 have approximately the same constants and are adjusted to have the same initial tension, each fly weight exerts an equal braking force irrespective of the pr sition of member 16.

hat is claimed is:

1. A centrifugal governor comprising a. supporting member, a fly Weight pivotally mounted thereon, an adjustable member attached to said iveight, a rotatable member, and means attached to said adjustable member and rotatable member for restraining the fly weight against centrifugal motion.

2. A centrifugal governor comprising a supporting member, a pair of fly weights pivotally mounted thereon. springs for retarding the movements of said weights, means for equa-lizing the tension of said springs, and additional means for simultaneously and uniformly varying the tension of said spring means.

3. A centrifugal governor comprising a supporting member, a pair of fly Weights each of said Weights having a pliableadjusting member secured to the free end thereof, a rotatable member, and spring means cooperating with said adjusting members and rotatable member to restrain the fly weights against centrifugal motion.

4. A centrifugal governor comprising a plurality of fly weights, spring members individual to each of said weights to restrain the weights against centrifugal motion, adjusting means for equalizing the restraining effect of said spring members, and additional adjusting means for simultaneously and uniformly Varying the restraining effect of the spring members.

In witness whereof, I hereunto subscribe my name this 27th day of December A. D.,

HENRY F. DOBBIN. 

